{"id":56614,"date":"2025-07-02T10:01:32","date_gmt":"2025-07-02T10:01:32","guid":{"rendered":""},"modified":"2025-09-12T05:18:22","modified_gmt":"2025-09-12T11:18:22","slug":"cve-2025-4334-critical-privilege-escalation-vulnerability-in-simple-user-registration-plugin-for-wordpress","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-4334-critical-privilege-escalation-vulnerability-in-simple-user-registration-plugin-for-wordpress\/","title":{"rendered":"CVE-2025-4334: Critical Privilege Escalation Vulnerability in Simple User Registration Plugin for WordPress<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The Simple User Registration plugin for WordPress, a popular tool used for streamlining user registration processes on numerous websites, is facing a serious security issue. The vulnerability, designated as CVE-2025-4334, allows for privilege escalation and can potentially lead to system compromise or data leakage. The vulnerability exists in all versions of the plugin<\/a> up to and including 6.3. This issue is particularly critical due to the widespread use of WordPress<\/a>, which means a large number of websites could potentially be affected.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-4334
\nSeverity: Critical (9.8 CVSS score)
\nAttack Vector: Remote
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: System Compromise<\/a>, Data Leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Simple User Registration Plugin for WordPress<\/a> | Up to and including 6.3<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability originates from the inadequate restrictions on user<\/a> meta values that can be supplied during the registration process. An attacker can manipulate these values to register as an administrator without the need for authentication. Once the attacker has admin privileges<\/a>, they can compromise the system or leak sensitive data.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

To exemplify, an attacker could potentially<\/a> send a manipulated HTTP POST request to the registration endpoint, using a JSON object with malicious content to exploit the vulnerability. This could look something like:<\/p>\n

POST \/wp-json\/user-registration\/v1\/users HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{\n\"username\": \"attacker\",\n\"email\": \"attacker@example.com\",\n\"password\": \"Password123\",\n\"role\": \"administrator\"\n}<\/code><\/pre>\n
In the above example, the `”role”: “administrator”` line is the crucial point. This is where the attacker assigns themselves an admin role during the registration process. Under normal circumstances, the system should not allow this, but due to the vulnerability in the plugin<\/a>, the system fails to adequately check and restrict these meta values.<\/p>\n
Mitigation and Remediation<\/strong><\/p>\n
The most straightforward way to mitigate this vulnerability is to apply the patch provided<\/a> by the vendor. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to monitor and control<\/a> incoming traffic can serve as a temporary mitigation strategy. These tools could potentially identify and block attempts to exploit the vulnerability<\/a>.
\nFinally, it is crucial to regularly update all software, including plugins, as outdated software is often a prime target for cyber attackers exploiting known vulnerabilities<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The Simple User Registration plugin for WordPress, a popular tool used for streamlining user registration processes on numerous websites, is facing a serious security issue. The vulnerability, designated as CVE-2025-4334, allows for privilege escalation and can potentially lead to system compromise or data leakage. The vulnerability exists in all versions of the plugin up […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[76],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-56614","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-privilege-escalation"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t